WASHINGTON (WUSA) -- Thursday morning began with several accidents as icy road conditions created problems for drivers in the area.

Montgomery County Police reported multiple crashes on major roads with particularly slick ramps and bridges. About a dozen roads have been listed for icy conditions and closures. On southbound I-270 at the sky ramp to eastbound 370, someone was injured in a dump truck accident. Another person was injured at Norbeck and Avery Road. Police are directing traffic around ice on Rockville Pike at Grosvenor Lane in Bethesda, where the southbound lanes are blocked. Ramps on 370 toward 200 are icy, say police. Places also causing problems for drivers Thursday morning were the Outer Loop between Georgia Avenue and Connecticut, Great Seneca Highway, Columbia Pike and New Hampshire Avenue, the 7800 block of Wisconsin Avenue, and West Gude Drive at Research Boulevard.

Fairfax County Parkway is shut down northbound and southbound at Rolling Road due to ice. There have already been three accidents on the parkway and Rolling Road. Some injuries were reported, but nothing serious, say police. The bridge on Rolling Road is also icey. VDOT crews are on the way with salt trucks.

US Park Police responded to the scene of an accident on Arlington Memorial Bridge. All outbound lanes were blocked on the bridge after the multi-vehicle crash. The vehicles were being removed and police were waiting on a salt truck to arrive at last check.

Meteorologist Howard Bernstein took time before his forecast to illustrate the black ice conditions using a lawn chair cushion on the weather terrace. One side of the cushion is wet while the other side has an icy crust. Watch his explanation here.